Affiliation: | Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching, Germany;Observatoire de Strasbourg, 11, rue de l'Universite, F-67000, Strasbourg, France;Institute of Astronomy, School of Physics, A29, University of Sydney, NSW 2006, Australia;Physics, Astronomy and Mathematics Department, University of Hertfordshire, Hatfield AL10 9AB |